# case 06 NTC 

## Introduction ##

 The temperature sensor is a sensor that can sense the temperature and convert the temperature to output signal. The temperature sensor is core of temperature measurement instrument.


## Products Link

[ELECFREAKS Experiment Box Kit](https://shop.elecfreaks.com/products/elecfreaks-experiment-box-kit-without-micro-bit-board?_pos=1&_sid=ac099db2f&_ss=r)

## Hardware Connect ##

![](./images/Tk7Ddy9.png)

 Connect circuit as above picture and put 2 AAA batteries into batteries pack.

## Principles of Circuits ##

![](./images/8pV3WaA.png)

 The GND of slot on micro:bit is into innards of batteries' GND to generate current loop.

## Introduction of Components ##

### NTC ###
 The NTC is an analog temperature sensor where the output voltage and temperature form a liner relationship. The higher the temperature, the larger the output voltage.
 The experiment box included a NTC.

![](./images/M3k99Lj.png)

***Note:*** Please note the positive and the negative when you are connecting.

## Software

### Step 1

 Click [makecode https://makecode.microbit.org/#](https://makecode.microbit.org/#)。

 Click on "New Project" and set a new Project.

![](./images/t34k5Zb.png)

### Step 2

 Reduction Formula：

![](./images/sTfPnYc.png)

 The reading is an analog value of the IO port, we need a formula as above to convert the values into Celsius.


### Step 3

 Set "Temperature" as a variable to store the Celsius.
 As above formula, convert the values of P0 into Celsius.

![](./images/N91GU48.png)

 Show the temperature value and pauce a second.

![](./images/poCULlT.png)

### Program

 Program link：[https://makecode.microbit.org/_h8hUjXYFM0yH](https://makecode.microbit.org/_h8hUjXYFM0yH)

 You also could directly download program by visiting website as below:

<div style="position:relative;height:0;paddingbottom:70%;overflow:hidden;"><iframe style="position:absolute;top:0;left:0;width:100%;height:100%;" src="https://makecode.microbit.org/#pub:_h8hUjXYFM0yH" frameborder="0" sandbox="allowpopups allowforms allowscripts allowsameorigin"></iframe></div>  

## Result

 Show the current temperature on the micro:bit allay.



## Think

 

## Questions



## More Information